Level 58 now, just doing nightmare dungeons (~tier 13-15 depending on the key I have available. Pretty mixed on the game overall....the action stuff is great, the rpg stuff is not.
Good stuff:
-Moment to moment action is awesome
-Looks and sounds fantastic
-Aspects are fun to get initially from dungeons and a cool way to augment gear
-Being able to skip the campaign and having renown/lilith statues carry to alts is nice
-World itself is cool and well designed
-Decent variety of end game activities, though Nightmare dungeons do kinda feel much more optimal
-The PvP is surprisingly fun
-Superrrr stable launch and weekend.
Bad stuff:
-Itemization is awful. Most of the affixes suck and the marginal % increases you get on the ones that don't suck are barely noticeable due to the way scaling/progression is handled. There's nothing akin to hitting a breakpoint in Diablo 2 for example. You get a few extra % on the stats you want but then you just go up a key level anyway so the monsters are equally more powerful. Basically means you're doing the same content over and over again.
-The bad itemization is compounded with the way loot is distributed - need a filter/some way to see if shit is worth picking up. The names of items as they drop indicate basically nothing about their quality so you're sifting through a ton of garbage at the end of each run. Basically just scanning the ilvl and tossing everything out that's below x.
-Further compounded by the upgrade/aspect system - when you do get an upgrade it's so marginal but you also have to invest heavily into it with upgrades and aspects (especailly if you're at the point where you're not using the base aspect and instead trying to get a better, extracted version)
-The uniques so far are pretty wack
-Level scaling sucks and is lazy. It's terrible during the campaign as leveling up often makes you feel weaker - basic enemies just become sponges at certain points. Combine this with the tediously incremental item power creep and it just feels very homogenized.
-Once you've got your build you're basically locked in to most aspects and again, you start the search for the items with the good rolls on them to extract
-Basically it's an incredibly grindy end game but by the time you actually start to see those power spikes that you want out of an ARPG, there's no real reason to continue playing
-It's nice that they let you skip the campaign and stuff on alts but it's hard to imagine doing that grind several times over. Feels like a game I'll come back to every few seasons for a week
-World is cool and well designed but also pretty samey. Not many memorable areas (parts of act 5/6 come to mind, the tree area is super cool). It all just blends together.